EP0106443B1 - Pharmaceutical oral-controlled release multiple-units formulation - Google Patents

Pharmaceutical oral-controlled release multiple-units formulation Download PDF

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Publication number
EP0106443B1
EP0106443B1 EP83304583A EP83304583A EP0106443B1 EP 0106443 B1 EP0106443 B1 EP 0106443B1 EP 83304583 A EP83304583 A EP 83304583A EP 83304583 A EP83304583 A EP 83304583A EP 0106443 B1 EP0106443 B1 EP 0106443B1
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EP
European Patent Office
Prior art keywords
units
controlled release
weight
coating
formulation according
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EP83304583A
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German (de)
English (en)
French (fr)
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EP0106443A3 (en
EP0106443A2 (en
Inventor
Stig Roswall
Lene Birgitte Thorhus
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Benzon Pharma AS
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Benzon Pharma AS
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Priority to AT83304583T priority Critical patent/ATE65181T1/de
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Publication of EP0106443A3 publication Critical patent/EP0106443A3/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/20—Pills, tablets, discs, rods
    • A61K9/2072—Pills, tablets, discs, rods characterised by shape, structure or size; Tablets with holes, special break lines or identification marks; Partially coated tablets; Disintegrating flat shaped forms
    • A61K9/2077—Tablets comprising drug-containing microparticles in a substantial amount of supporting matrix; Multiparticulate tablets
    • A61K9/2081—Tablets comprising drug-containing microparticles in a substantial amount of supporting matrix; Multiparticulate tablets with microcapsules or coated microparticles according to A61K9/50
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
    • A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
    • A61K9/5073—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals having two or more different coatings optionally including drug-containing subcoatings

Definitions

  • the present invention relates to an oral pharmaceutical controlled release multiple-units dosage form with important new features.
  • Dosage forms should therefore be designed so that such variable factors do not compromise the efficacy and safety of the product.
  • a reproducible gastrointestinal transit time of a depot formulation can be achieved only by a controlled release multiple-units dosage form.
  • controlled release multiple-units formulation indicates a pharmaceutical formulation comprising a multiplicity (typically at least 100) of individual coated (or "microencapsulated") units contained in the formulation in such a form that the individual units will be made available from the formulation upon disintegration of the formulation in the stomach of animals, including humans, who have ingested the formulation.
  • the multiple-units formulation may be a capsule which disintegrates in the stomach to make available a multiplicity of individual coated units contained in the capsule, or a tablet which disintegrates in the stomach to make available a multiplicity of coated units originally combined in the tablet.
  • Drug release from a control led release dosage form is generally controlled either by diffusion through a coating or by erosion of a coating by a process dependent on, e.g., enzymes or pH.
  • a pH independent diffusion with respect to obtaining a reproducible rate of availability and to minimizing intra- and intersubject variations is known (GB Patent No. 1 468 172 and Bechgaard & Baggesen, 1980).
  • controlled drug release in vivo can be achieved through an erodable process by enteric coating of a multiple-units dosage form (Green, 1966; McDonald et al., 1977; Bogentoft et al. , 1978).
  • Both above-mentioned types of controlled release multiple-units formulation techniques aim at a controlled release of active substance in a predetermined pattern to reduce and delay the peak plasma concentration without affecting the extent of drug availability. Due to a lower peak plasma concentration, the frequency of undesirable side-effects may be reduced, and due to the delay in the time it takes to obtain the peak plasma concentration and the prolongation of the time at the therapeutically active plasma concentration, the dosage frequency may be reduced to a dosage taken only twice or once daily, in order to improve patient compliance.
  • a further advantage of the controlled release multiple-units dosage form is that high local concentrations of the active substance in the gastrointestinal system is avoided, due to the units being distributed freely throughout the gastrointestinal tract, independent of gastric emptying. If the mucosa of the stomach is more sensitive to the active substance than the intestinal mucosa, controlled release formulations avoiding release of active substance in the gastric area will be preferred; formulations of this type are controlled release multiple-units formulations in which the coatings are substantially resistant to gastric conditions.
  • the present invention deals with multiple-units dosage forms which comprise a combination of two active substances one of which is diffusion coated.
  • diffusion film-coating mixtures which contain synthetic film-forming agents dissolved or dispersed in organic solvents, e.g. isopropanol, ethanol, acetone, or mixtures thereof.
  • organic solvents e.g. isopropanol, ethanol, acetone, or mixtures thereof.
  • the units contain a readily soluble active substance, it has been often difficult to obtain a sufficiently slow release of the active substance.
  • the present invention provides a pharmaceutical oral controlled release multiple-units formulation in which individual units comprise coated units containing a first therapeutically active substance which is subject to controlled release as a result of coating of the units with a controlled release diffusion coating comprising a polymeric film forming substance selected from cellulose derivatives, acrylic polymers, vinyl polymers and other high molecular weight synthetic polymers such as ethylcellulose, cellulose acetate, cellulose propionate, cellulose butyrate, cellulose valerate, cellulose acetate propionate, polyvinyl acetate, polyvinyl formal, polyvinyl butyral, ladder polymer of sesquiphenyl siloxane, polymethyl methacrylate, polycarbonate, polystyrene, polyester, coumarone-indene polymer, polybutadiene, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer and vinyl chloride-propylene-vinyl acetate copolymer, the units additionally compris
  • pharmaceutical oral controlled release multiple-units formulations are prepared by mixing units containing an active substance and coated with a substantially water-insoluble, but water diffusable controlled release coating, with particles of an active substance the mean size of which is at least one power of ten smaller than the coated units, under conditions which will result in adherence of the smaller particles to the surface of the controlled release coating in a substantially uniform layer.
  • the mixing of the coated units with the smaller particles is performed under conditions which will result in adherence of the smaller particles to the surface of the controlled release coating in a substantially uniform layer.
  • This mixing is of the type of the so-called ordered mixing where mechanical, adhesional, or coating forces or methods are used to prepare an ordered unit in a mix such that the ordered unit will be the smallest possible sample of the mix and will be nearly identical in composition to all other ordered units in the mix (cf., e.g, Lieberman & Lachman, 1981).
  • the active substance adhered to the surface of the controlled release coating is present in an amount of no more than 25% by weight, preferably no more than about 10% by weight, in particular no more than about 5% by weight, especially no more than about 2% by weight, and preferably no more than 1% by weight such as 0.5-1% by weight, calculated on the weight of coated units.
  • the formulation of the invention will additionally comprise an antiadhesive adhered to the coated units .
  • the antiadhesive is normally a fine particle powder which counteracts electrostatic charging.
  • antiadhesives may be mentioned colloidal silicon dioxide, talc, metallic stearates, starches such as rice starch and stearic acid.
  • the function of the antiadhesive is to improve the flow characterstics of the powder, to prevent the fine particles from adhering to each other, and to prevent the fine particles from adhering to the mixer walls.
  • the amount of anti-adhesive should be adapted in accordance with the particular coated units, the particular particles which are to be adhered to the surface of the coated units, the mixing equipment. As a general rule, as little anti-adhesive should be used as possible, in order to avoid the undesired effect that the anti-adhesive will prevent the particles of active substance from adhering to the coated units. Typical amounts of anti-adhesive are amounts of about the same order of magnitude as the active substance itself, but variations of at least one power of ten downward and possibly even lower are also within the scope of the invention.
  • the dry coating or mixing process according to the invention may be performed by means of any usual suitable type of mixing equipment such as low shear mixer, including cone and cube mixers, and the characteristic way of performing the mixing is to mix for a sufficient period of time to obtain a steady state condition where there is substantial equilibrium between the amount of fine powder that is adhered to the larger units and the amount of fine particles which leave the larger units.
  • a condition for obtaining the steady state is that the relative amounts of the fine particles and the larger units are suitably adapted. If a too large amount of fine particles were present, the steady state condition and the uniform adherence to the coating on the larger particles would not be obtained.
  • the assessment of suitable ratios may easily be performed by the skilled art worker through preliminary tests.
  • the water-insoluble, but water-diffusable controlled release coating may be a coating of a known type which is prepared by application of diffusion film-coating mixtures which contain synthetic film-forming agents dissolved or dispersed in organic solvents, e.g. isopropanol, ethanol, acetone, or mixtures thereof.
  • organic solvents e.g. isopropanol, ethanol, acetone, or mixtures thereof.
  • the controlled release coating is of the type which is applied from an organic solvent as described above, but which has been made to release its content of active substance over a longer period of time.
  • This measure is of particular importance in connection with the coating of substances which exert a local irritating effect on the mucosa of the gastrointestinal tract such as potassium chloride.
  • the controlled release coating contains a film-forming substance, a plasticizer, and a hydrophobic substance.
  • the film-coating mixture of the above type is prepared and applied under such conditions that the hydrophobic substance must be considered to be effectively microdispersed in fluid condition throughout the coating solution.
  • the film-forming polymeric substances used for this type of coating mixtures are pharmaceutically acceptable film-forming polymers which are substantially water-insoluble, but which permit water diffusion.
  • examples of such substances are cellulose derivatives, for instance ethylcellulose, acrylic polymers, vinyl polymers, and other high molecular synthetic polymers such as ethylcellulose, cellulose acetate, cellulose propionate, cellulose butyrate, cellulose valerate, cellulose acetate propionate, polyvinyl acetate, polyvinyl formal, polyvinyl butyral, ladder polymer of sesquiphenyl siloxane, polymethyl methacrylate, polycarbonate, polystyrene, polyester, coumarone-indene polymer, polybutadiene, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer and vinyl chloride-propylene-vinyl acetate copolymer.
  • the hydrophobic substance incorporated may be any pharmaceutically acceptable hydrophobic substance which will result in the desired retardation of the diffusion (in the present context, the term "hydrophobic" indicates substances which, relative to water, have a contact angle of more than 90°). All such hydrophobic substances are substances which, by themselves, that is, without admixture with other components, are capable of forming a continuous phase (that is, either by being molten or by being dissolved and subjected to removal of the solvent). The amount of the hydrophobic substance incorporated will depend on the properties of the hydrophobic substance, in particular its hydrophobicity, with respect to delaying the water diffusion of the polymeric film.
  • hydrophobic substances are substances selected from hydrocarbons and hydrocarbon derivatives, waxes, oils and fats, and mixtures thereof.
  • wax-like substances which are interesting for the purpose of the present invention are wax-like substances.
  • wax-like substances are beef tallow, whale wax, beeswax, solid paraffin, castor wax, and higher fatty acids such as myristic, palmitic, stearic and behenic acids and esters thereof.
  • the hydrophobic substances will usually have a melting temperature below 100°C.
  • the hydrophobic substance e.g. a waxy substance such as paraffin wax
  • a waxy substance such as paraffin wax
  • the hydrophobic substance will normally be present in the coating in an amount of between 1 and 25%, in particular between 3 and 20%, especially between 5 and 18%, such as between 9 and 17%, calculated on the weight of the dry matter of the coating suspension.
  • the diffusion coatings applied from an organic solvent also comprise a plasticizer.
  • plasticizers may be mentioned triacetin, acetylated monogyceride, rape oil, olive oil, sesame oil, acetyltributylcitrate, acetyltriethylcitrate, glycerin, sorbitol, diethyloxalate, diethylmalate, diethylfumarate, diethylsuccinate, diethylmalonate, dioctylphthalate, dibutylsebacate, triethylcitrate, tributylcitrate, glyceroltributyrate, polyethyleneglycol, propyleneglycol, and mixtures of the above.
  • the plasticizer is normally used in an amount of less than 1% by weight, calculated on the weight of the dry matter of the coating mixture.
  • water-based film-coating mixtures that is, mixtures containing a synthetic film-forming agent dispersed in water, for instant-release coating of tablets, e.g. as taste masking.
  • known water-based film-coating mixtures are not suitable for the preparation of controlled relase multiple-units formulations.
  • Eudragit® E 30 D a copolymerisate of acrylic acid ethyl ester and methacrylic acid methyl ester
  • Aquacoat® ethylcellulose
  • both of these known water-dispersible film-forming agents suffer from the disadvantage that the water insoluble film they form is tacky, which incurs
  • the water-based film-coating mixtures are excellent; they are non-polluting and incur no health hazard, and as they have a high dry matter content, (normally above 15%), they permit a short process time.
  • the coating comprises a combination of a water-dispersible film-forming polymeric substance, and a hydrophobic substance which by itself is capable of forming a continuous phase.
  • the water-dispersible film-forming polymeric substances contemplated for the purpose of the present invention are pharmaceutically acceptable film-forming polymers which are substantially water-insoluble, but which permit water diffusion.
  • examples of such substances are cellulose derivatives, for instance ethylcellulose, and acrylic polymers, for instance a copolymerisate on the basis of poly(meth)acrylic acid esters, one example of which is the commercial product Eudragit®E 30 D.
  • the hydrophobic substances used in the water-based coating mixtures will often have a melting temperature below 200°C, more often below 150°C and usually below 100°C.
  • hydrophobic substance used in combination with a water-dispersible film-forming polymeric substance are the same types and are used in the same amounts as mentioned above in connection with the discussion of the organic solvent-based film-forming substances.
  • a finely divided, substantially insoluble, pharmaceutically acceptable non-wetting powder having antiadhesive properties may be incorporated in the coating.
  • examples of such substances are calcite, substantially insoluble calciumphosphates or substantially insoluble calcium phosphates, colloidal silica and talc, which is preferably incorporated in the coating in an amount of from about 1 to 35% by weight, in particular 5 - 25% by weight, and preferably about 10-20% by weight, calculated on the dry matter content of the coating.
  • This finely divided powder may simply be applied together with a film-forming polymeric substance, that is, disposed in the water-based film-coating dispersion.
  • the particle size of the powder should be adapted so that it will not sediment in the coating mixture or block jets and tubes in the coating equipment; normally, the particle size of the powder should be below about 40 ⁇ m.
  • the hydrophobic substance in this type of coating mixtures is preferably applied in the form of an emulsion of particles of the hydrophobic substance at a temperature below the melting or softening temperature of the hydrophobic substance. Normally, it is preferred to disperse the hydrophobic substance in the coating mixture by heating to about the melting or softening point of the hydrophobic substance, dispersing, and subsequently cooling.
  • the finely divided powder, such as talc is preferably incorporated by addition to the heated mixture during dispersion.
  • the individual units of the multiple-units formulations according to the invention will normally be either coated crystals or pellets (coated cores).
  • the core is constituted by a combination of active substance and excipients.
  • a type of core which is widely used in the known art vide, e.g., Eur. Patent Application No. EP-A-13262 is a substantially spherical particle of a size of about 0.5 - 1 mm consisting of excipient(s) with active substance applied to its surface.
  • Typical cores of this type are the so-called "non-pareil" cores where the excipients are in the form of spherical particles of saccharose. It is also known, e.g., from GB Patent Specification No.
  • cores which are cross-sectionally substantially homogeneous designates cores in which the active substance is not confined to an exterior layer on the core body, in other words normally cores which, through the cross-section of the core body, contain substantially the same type of composition comprising microparticles containing active substance, in contrast to the non-pareil type of cores which each consist of an excipient body with active substance applied to its surface, and in contrast to coated crystal units which are substantially monolithic crystals.
  • the cores which are cross-sectionally substantially homogeneous will normally consist of a mixture of active substance with excipient(s), (and in spite of the term “homogeneous", this mixture will not necessarily be qualitatively or quantitatively homogeneous through the cross-section of the particle but may show, e.g., a concentration gradient of one or more of its constituents) or they may consist substantially solely of active substance in a non-monolithic form, e.g. as a sintered mass of crystalline or amorphous particles of active substance.
  • cores which are cross-sectionally substantially homogeneous will, for the sake of brevity, often simply be designated "cores".
  • diffusion-coated cores containing a medicament substance which has a pH-dependent solubility comprise a buffer substance which, in accordance with the principles disclosed in GB Patent No. 1 468 172, serves to establish a controlled pH interval inside the pellets during passage of the pellets through the gastrointestinal system, thereby securing that the medicament substance in the cores will be dissolved under controlled pH conditions.
  • the pharmaceutical oral controlled release multiple-units formulation according to the invention will typically be a capsule containing a multiplicity of the units, typically more than 100, a sachet containing a multiplicity of the units , typically more than 1000, or a tablet made from a multiplicity of the units, typically more than 100, in such a manner that the tablet will disintegrate substantially immediately upon ingestion in the stomach into a multiplicity of individual units which are distributed freely throughout the gastro-intestinal tract.
  • a tablet according to the invention in particular when the tablet is to contain a rather large amount of active substance and is to be easy to swallow, is a shape substantially corresponding to a cylinder with rounded ends, a raised area circumscribing the periphery of the cylinder in the form of flat belt and a score dividing the cylinder, but not the peripheral belt, into two parts, substantially as shown in the drawing.
  • the controlled release coated active substance is potassium chloride crystals and the instant release active substance is a diuretic, e.g. in tablet sizes comprising 600 mg of potassium chloride and 5 mg of clopamide for patients in diuretic treatment to prevent potassium deficiency.
  • the cores are preferably cross-sectionally substantially homogeneous cores.
  • the use of cross-sectionally substantially homogeneous cores offers several advantages.
  • the size of the cores may be easily adjusted as desired, to improve the distribution pattern of the units throughout the gastrointestinal tract; this forms a contrast to the non-pareil technique where the size variation is limited by the available standard sizes.
  • the composition of the cores may be optimized with respect to the extent of drug availability, i.e., to enhance the release of the active substance.
  • the cores are typically made by granulating particles of the active substance together with excipients, including bulk agents such as carbohydrates and derivatives thereof such as starch and starch derivatives, including microcrystalline cellulose, binders such as cellulose derivatives, including methylcellulose or hydroxypropylmethylcellulose, polyethylene glycol, polyvinylpyrrolidone, agar, or gelatin, for instance by treatment in a high speed mixer (to directly obtain compact-shaped cores), or by treatment in a planet mixer with subsequent extrusion of the mixture into strings of a predetermined diameter approaching the desired final cross-sectional dimension of the cores and treatment of the strings in a marumerizer or similar equipment to obtain compact-shaped cores.
  • excipients including bulk agents such as carbohydrates and derivatives thereof such as starch and starch derivatives, including microcrystalline cellulose, binders such as cellulose derivatives, including methylcellulose or hydroxypropylmethylcellulose, polyethylene glycol, polyvinylpyrrolidone, agar, or gelatin, for
  • the diameter of the cores is normally adapted so that the diameter of the coated core is 0.4 - 1.2 mm, in particular 0.5 - 1.0 mm, especially 0.5 - 0.8 mm, such as 0.5 - 0.7 mm.
  • a preferred diameter of the coated cores is 0.5 - 0.6 mm.
  • the predetermined controlled release of the active substance may be changed by changing the density of the cores, and thus, the time of arrival of the cores in the predetermined section of the intestine may be varied at will.
  • the density of the cores With resulting increased transit time of the coated cores (Bechgaard & Ladefoged, 1978), a more delayed and longer lasting absorption phase is obtained, that is, a longer period during which the absorption of the active substance takes place after the substance has been released by diffusion of the coating, thus having become available for absorption.
  • excipients which may be used to increase the density of the cores are described in US Patent No. US-B-4 193 985 and include heavy particulate substances such as barium sulphate, titanium oxide, zinc oxides, and iron salts.
  • a buffer substance is incorporated in the core when the medicament substance is one which has a pH-dependent solubility.
  • the buffer or buffer mixture is preferably so selected that the buffered system in the cores obtains a pH between 1 and 7.5, in particular a pH in the range from about 4 to about 6.
  • the amount of buffer should be sufficient to obtain a buffer effect during the period necessary for the release of the active substance and may easily be determined by the skilled art worker through simple tests.
  • suitable pharmaceutically acceptable buffer substances may be mentioned primary, secondary or tertiary salts of phosphoric acid or salts of phthalic acid, citric acid, tartaric acid, or salts of aminoacids such as glycine, or mixtures of such buffer salts.
  • a typical concentration of buffer substance in the cores is in the range of from 3 to 40% by weight, calculated on the core constituents, preferably from about 5 to about 30% by weight.
  • the units coated according to the invention are crystals, they normally have a size between 0.2 and 1.5 mm, preferably between 0.2 and 0.6 mm.
  • potassium chloride may be mentioned as an important example of an active substance which is suitably used in the form of crystals.
  • the active substances in the combination formulations according to the invention may be any active substances which is advantageously administered in a controlled release multiple-units formulation and the other active substance is available as an instant release active substance.
  • suitable active substances incorporated in the controlled release unit are found among almost all therapeutic groups, including diuretics, ⁇ -blockers, vasodilators, analgesics, bronchodilators, hormones, oral antidiabetics, antihypertensives, antibiotics, and potassium chloride.
  • Suitable active substances used as the instant release drug in the combination formulations are found among almost all therapeutic groups, including diuretics, ⁇ -blockers, vasodilators, analgesics, bronchodilators, hormones, oral antidiabetics, antihypertensives, and antibiotics.
  • Preferred combinations of the above-mentioned components of the combination product may be found among controlled release coated potassium chloride units such as crystals, and instant release diuretics such as metolazone, clopamide, ethacrynic acid, hydroflumethiazide, methyclothiazide, quinethazone, trichloromethiazide, chlorothiazide, chlorothalidone, cyclothiazide, furosemide, hydrochlorothiazide, polythiazide, bendroflumethiazide, cyclopenthiazide, mefruside, and bumetanide.
  • controlled release coated potassium chloride units such as crystals
  • instant release diuretics such as metolazone, clopamide, ethacrynic acid, hydroflumethiazide, methyclothiazide, quinethazone, trichloromethiazide, chlorothiazide, chlorothalidone, cyclothiazi
  • active substances which are advantageously controlled release coated some are characterized as having a pH-dependent solubility, others as having a pH-independent solubility.
  • active substances which have a pH-dependent solubility may be mentioned pindolol, lithium carbonate, acemetacin, vincamine, dipyridamol, theophyllin, dextropropoxyphen, furosemide, and hydralazin.
  • Active substances having a pH-dependent solubility are preferably incorporated in cores in combination with buffer substances such as discussed above, in order to obtain a dissolution of active substance which is substantially independent of the gastrointestinal pH variations through which the units pass.
  • active substances with a solubility which is not pH-dependent may be mentioned propranolol and atenolol.
  • formulations according to the invention are formulations in which the active substance, apart from being a substance about which it is known or indicated from a pharmacokinetic and/or clinical point of view that it is advantageously administered in a controlled release multiple-units formulation, is a substance which exerts an irritating effect on the gastric mucosa such as acetylsalicylic acid, potassium chloride, and which is usually administered concomittantly to an active substance such as a diuretic.
  • the active substance apart from being a substance about which it is known or indicated from a pharmacokinetic and/or clinical point of view that it is advantageously administered in a controlled release multiple-units formulation, is a substance which exerts an irritating effect on the gastric mucosa such as acetylsalicylic acid, potassium chloride, and which is usually administered concomittantly to an active substance such as a diuretic.
  • the invention also makes it possible to combine two active substances with significantly different half lives in order to harmonize the duration of time above a therapeutically active plasma level .
  • the active substance with the shorter half life should be incorporated in the controlled release coated units, and the active substance with the longer half life should be used as the instant-release substance, thus simplifying dosage regimen and improving patient compliance by administering only one type of tablet or capsule.
  • the diffusion coating applied on the units according to the invention is applied either from a solution and/or suspension in an organic solvent or from an aqeous coating mixture.
  • the application from a solution and/or suspension in an organic solvent will be discussed first.
  • suitable solvents may be mentioned alcohols such as ethanol, methanol, isopropanol, and propanol, ketones such as acetone, and toluene.
  • alcohols such as ethanol, methanol, isopropanol, and propanol
  • ketones such as acetone, and toluene.
  • diffusion coating materials which may be used for the purpose of the present invention are mentioned above.
  • Preferred coating materials are cellulose derivatives such as, e.g., ethylcellulose, and acrylic polymers such as polymethylmethacrylate, e.g., the so-called Eudragit® coatings.
  • the coating material may be admixed with various excipients such as plasticizers, inert fillers, and pigments, in a manner known per se.
  • the amount of coating applied is adapted so as to obtain a predetermined dissolution characteristic of the coated units. Normally, the amount of the coating will be 0.5-25% by weight, calculated as dry matter on the total weight of the units, typically 1-15% by weight, depending on the predetermined dissolution characteristics of the active substance and the desired release profile.
  • the diffusion coating applied on the units according to the invention may also be a diffusion coating which is applied from a solution and/or suspension in water.
  • the application of the coating is typically performed in a fluidized bed or by pan coating.
  • water-based diffusion coating materials which may be used for the purpose of the present invention are coatings selected from the group consisting of acrylic polymers and copolymers, e.g., a polymerisate of acrylic acid ethyl esters and methacrylic acid methyl ester such as Eudragit® E 30 D or ethylcellulose such as Aquacoat® ECD-30.
  • acrylic polymers and copolymers e.g., a polymerisate of acrylic acid ethyl esters and methacrylic acid methyl ester such as Eudragit® E 30 D or ethylcellulose such as Aquacoat® ECD-30.
  • the coating material may be admixed with various excipients such as plasticizers, inert fillers, and pigments, in a manner known per se.
  • plasticizers are the same as mentioned in connection with the organic solvent-based coating mixtures.
  • the amount of coating applied from a water-based coating mixture is adapted so as to obtain a predetermined dissolution characteristic of the coated units.
  • the amount of the coating will be 2 - 25% by weight, calculated as dry matter on the total weight of the units, typically about 15% by weight, depending on the predetermined dissolution characteristics of the active substance and the desired release profile.
  • the units prepared according to the invention may be incorporated in normal pharmaceutical dosage forms or formulations such as capsules containing a multiplicity of the units, sachets containing a multiplicity of the units, or tablets which will disintegrate substantially immediately upon ingestion in the stomach to form a multiplicity of individual units.
  • the adjuvants and excipients used in the preparation of disintegratable tablets are of the same kind as conventionally used in the pharmaceutical industry for this purpose.
  • Examples of filler or diluents useful for preparing tablets according to the invention are lactose, sucrose, dextrose, mannitol, calcium sulphate, dicalcium phosphate, tricalcium phosphate, starches such as rice starch and microcrystalline cellulose.
  • Useful binders are acacia, tragacanth, gelatine, sucrose, pregelatinized starch, starch, sodium alginate, ammonium calcium alginate, methylcellulose, sodium carboxymethylcellulose, ethylcellulose, hydroxypropylmethylcellulose, polyvinylpyrrolidone, magnesium aluminum silicate, and polyacrylamides.
  • disintegrants may be mentioned starches and starch derivatives, clays, and celluloses including microcrystalline cellulose, alginates and gums, including agar, and tragacanth.
  • lubricants “glidants” and “anti-adherents” may be mentioned metallic stearates, talc, high melting point waxes, and colloidal silicon dioxide.
  • excipients or adjuvants for the preparation of sachets or capsules such as fillers and lubricants, these may be of the same type as described above.
  • a sample containing film-coated KCI-crystals with clopamide adhered to the surface was placed on a sieve.
  • the mesh of the sieve had a size of 212 ⁇ m preventing the film-coated KCI-crystals from passing, but allowing any other part of the sample to pass.
  • the disintegration time of tablets was measured according to Ph. Eur. 2nd Ed. I, V.5.1.1. using a disc.
  • the content of potassium chloride was determined by heating 10 tablets in water until boiling.
  • Content uniformity of clopamide is determined in 10 tablets, treating each tablet with 0.1 M hydrochloric acid (pH 1.2) in an ultrasonic bath for 1 hour.
  • the quantity of clopamide in each tablet was determined spectrophotometrically at 242 nm.
  • the content uniformity of clopamide must meet the requirements for tablets stated in USP XX p 955, i.e. the content of clopamide per tablet may vary from 4.25 mg to 5.75mg.
  • Concentrations of clopamide were analyzed by a HPLC method after extraction from plasma.
  • An S5 ODS Spherisorb column was used and the mobile phase was acetonitrile:0.05 N sulphuric acid 2:1.
  • a calibration curve was made on spiked plasma, and a linearity between peak height and plasma concentration of clopamide could be revealed in the range 20 ng/ml to 500 ng/ml.
  • Potassium in urine was measured by a flame photometric method.
  • a film-coating mixture was prepared from 2.809 kg paraffin, 0.983 kg acetyl tributyl citrate, 18.433 kg ethylcellulose, 0.281 kg colloidal silicon dioxide and 372.494 kg isopropanol.
  • the paraffin was melted in 123 kg of the isopropanol by heating in a mixer equipped with a heating jacket at 70°C.
  • the acetyl tributyl citrate, the ethylcellulose and the silicium dioxide were added under vigorous stirring. The vigorous stirring was continued for about 1 hour, whereupon isopropanol was added up to 395 kg, and the stirring speed was reduced.
  • the film-coating mixture was then homogeneous and ready for use.
  • the film-coating mixture is used warm at approximately 70°C.
  • the film-coating mixture prepared as described above was sprayed onto 150 kg potassium chloride crystals using a fluidized bed.
  • the potassium chloride crystals were fluidized, and the film-coating mixture was sprayed onto the crystals at a temperature of about 70°C at a speed of about 500 g of film-coating mixture/minute.
  • the film-coated crystals were dried in a fluidized bed for 20 minutes, whereupon the film-coated crystals were cooled to about 20°C, while still lying in the fluidized bed.
  • This grinding may be performed by grinding the clopamide using a Fritsch Pulverisette 14, laboratory rotor-mill equipped with a 0.2 mm sieve.
  • Ground clopamide was coated by dry mixing onto film-coated potassium chloride crystals prepared as described in Example 1, in the presence of an anti-adhesive.
  • the amount of clopamide adhered was determined as described under MATERIALS AND METHODS.
  • Table 1 the influence of the anti-adhesive and the coating time on the adhesion tendency of clopamide is shown.
  • A designates the amount of clopamide adhered in per cent of the theoretical dose (600 mg potassium chloride, 5 mg clopamide) immediately after the dry coating
  • B designates the percentage of the theoretical dose of clopamide adhered per dose of finished granulate prepared as described in Example 4 below
  • C designates the percentage of a dose of clopamide being removed from the film-coated potassium chloride crystals during the mixing of the granulate (A - B).
  • Tablets were prepared from 0.5 kg clopamide, 2.64 kg talc, 69.509 kg film-coated potassium chloride crystals coated as described in Example 1, 2.40 kg microcrystalline cellulose, 18.551 kg rice starch and 2.40 kg of a 1:9 mixture of magnesium stearate and talc.
  • the clopamide and 1.00 kg of the talc are mixed and sieved through a 0.3 mm sieve.
  • the mixture was combined with 7 kg coated potassium chloride crystals and mixed in a 40 liters cone blender for 3 minutes.
  • the obtained mixture and the rest of the coated potassium chloride crystals were transferred quantitatively to a 300 liters cone blender, and the resulting mixture was mixed for 30 minutes.
  • the rest of the talc was sieved through a 1.4 mm sieve into the 300 liters cone blender and was mixed for one minute.
  • the microcrystalline cellulose and the rice starch were added, and the resulting mixture was mixed for 5 minutes.
  • the magnesium stearate mixture was mixed with 10 kg of the mixture obtained above for 3 minutes and was added to the rest of the mixture and mixed for 5 minutes.
  • the tablets were compressed into tablets having a weight of 960 mg, each comprising 5 mg clopamide and 600 mg potassium chloride using a capsule-shaped punch and a pressure of 2300 kg on a conventional rotating tabletting machine.
  • the shape of the tablets appears from the drawing.
  • Disintegration Time (determined as described under MATERIALS AND METHODS): 140 - 220 seconds
  • the disintegration time is well within the official requirements of a disintegration within 15 minutes when tested by this method.
  • the uniformity of mass is well within the official requirements permitting a variation from 915 to 1011 mg per tablet.
  • the tablets were administered at 09.00 am. after intake of breakfast. Two weeks' wash-out period separated the two test periods.
  • Urine was collected quantitatively 24 hours before drug administration and 24 hours after in aliquots: 0-1h, 1-2h, 2-3h, 3-4h, 4-6h, 6-8h, 8-12h, and 12-24h.
  • the extent of availability was calculated as the ratio between AUC0 ⁇ 36 for clopamide after the test and the standard preparation.
  • Availability of potassium was estimated by the total amounts of potassium excreted into urine during 24 hours after the administration of the two formulations.
  • the relative extent of availability of clopamide from Adurix KCI was 100,9% of that from Brinaldix, and the 95% confidence interval ranges from 93.1% to 109.4%.
  • the total 24 h urine was 160.4% - 95% confidence interval; 138.9 to 185.3% of that of control days. No significant differences between diuretic effect or diuretic profile after intake of clopamide in the two formulations were seen.
  • the total amount of potassium excreted during 24 hours was identical after intake of 2400 mg (32 mEq) potassium as Adurix KCI and Kalinorm.
  • the mean additional amount excreted, calculated as the difference between the amount excreted on control day and treatment day was 31.1 mEq after Adurix KCI and 30.0 mEq after Kalinorm (Table 4).

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EP83304583A 1982-08-13 1983-08-09 Pharmaceutical oral-controlled release multiple-units formulation Expired - Lifetime EP0106443B1 (en)

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AT83304583T ATE65181T1 (de) 1982-08-13 1983-08-09 Pharmazeutische orale formulierung mit mehrfachen einheiten, mit kontrollierter freisetzung.

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DK365282A DK152744C (da) 1982-08-13 1982-08-13 Fremgangsmaade til fremstilling af et farmaceutisk peroralt polydepotpraeparat

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Also Published As

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US4574080A (en) 1986-03-04
DK152744C (da) 1988-10-31
FI832909A7 (fi) 1984-02-14
ATE65181T1 (de) 1991-08-15
EP0106443A3 (en) 1985-11-27
DE106443T1 (de) 1984-09-13
DK365282A (da) 1984-02-14
JPS6238323B2 (enrdf_load_stackoverflow) 1987-08-17
DE3382341D1 (de) 1991-08-22
NO832895L (no) 1984-02-14
DK152744B (da) 1988-05-09
JPS5962521A (ja) 1984-04-10
EP0106443A2 (en) 1984-04-25
FI832909A0 (fi) 1983-08-12
CA1218305A (en) 1987-02-24
AU1785483A (en) 1984-02-16

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